src/script/common/c_content.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19 #include "common/c_content.h"
  20 #include "common/c_converter.h"
  21 #include "common/c_types.h"
  22 #include "nodedef.h"
  23 #include "object_properties.h"
  24 #include "cpp_api/s_node.h"
  25 #include "lua_api/l_object.h"
  26 #include "lua_api/l_item.h"
  27 #include "common/c_internal.h"
  28 #include "server.h"
  29 #include "log.h"
  30 #include "tool.h"
  31 #include "serverobject.h"
  32 #include "porting.h"
  33 #include "mapgen/mg_schematic.h"
  34 #include "noise.h"
  35 #include "util/pointedthing.h"
  36 #include "debug.h" // For FATAL_ERROR
  37 #include <json/json.h>
  38
  39 struct EnumString es_TileAnimationType[] =
  40 {
  41         {TAT_NONE, "none"},
  42         {TAT_VERTICAL_FRAMES, "vertical_frames"},
  43         {TAT_SHEET_2D, "sheet_2d"},
  44         {0, NULL},
  45 };
  46
  47 /******************************************************************************/
  48 void read_item_definition(lua_State* L, int index,
  49                 const ItemDefinition &default_def, ItemDefinition &def)
  50 {
  51         if (index < 0)
  52                 index = lua_gettop(L) + 1 + index;
  53
  54         def.type = (ItemType)getenumfield(L, index, "type",
  55                         es_ItemType, ITEM_NONE);
  56         getstringfield(L, index, "name", def.name);
  57         getstringfield(L, index, "description", def.description);
  58         getstringfield(L, index, "inventory_image", def.inventory_image);
  59         getstringfield(L, index, "inventory_overlay", def.inventory_overlay);
  60         getstringfield(L, index, "wield_image", def.wield_image);
  61         getstringfield(L, index, "wield_overlay", def.wield_overlay);
  62         getstringfield(L, index, "palette", def.palette_image);
  63
  64         // Read item color.
  65         lua_getfield(L, index, "color");
  66         read_color(L, -1, &def.color);
  67         lua_pop(L, 1);
  68
  69         lua_getfield(L, index, "wield_scale");
  70         if(lua_istable(L, -1)){
  71                 def.wield_scale = check_v3f(L, -1);
  72         }
  73         lua_pop(L, 1);
  74
  75         int stack_max = getintfield_default(L, index, "stack_max", def.stack_max);
  76         def.stack_max = rangelim(stack_max, 1, U16_MAX);
  77
  78         lua_getfield(L, index, "on_use");
  79         def.usable = lua_isfunction(L, -1);
  80         lua_pop(L, 1);
  81
  82         getboolfield(L, index, "liquids_pointable", def.liquids_pointable);
  83
  84         warn_if_field_exists(L, index, "tool_digging_properties",
  85                         "Deprecated; use tool_capabilities");
  86
  87         lua_getfield(L, index, "tool_capabilities");
  88         if(lua_istable(L, -1)){
  89                 def.tool_capabilities = new ToolCapabilities(
  90                                 read_tool_capabilities(L, -1));
  91         }
  92
  93         // If name is "" (hand), ensure there are ToolCapabilities
  94         // because it will be looked up there whenever any other item has
  95         // no ToolCapabilities
  96         if (def.name.empty() && def.tool_capabilities == NULL){
  97                 def.tool_capabilities = new ToolCapabilities();
  98         }
  99
 100         lua_getfield(L, index, "groups");
 101         read_groups(L, -1, def.groups);
 102         lua_pop(L, 1);
 103
 104         lua_getfield(L, index, "sounds");
 105         if(lua_istable(L, -1)){
 106                 lua_getfield(L, -1, "place");
 107                 read_soundspec(L, -1, def.sound_place);
 108                 lua_pop(L, 1);
 109                 lua_getfield(L, -1, "place_failed");
 110                 read_soundspec(L, -1, def.sound_place_failed);
 111                 lua_pop(L, 1);
 112         }
 113         lua_pop(L, 1);
 114
 115         def.range = getfloatfield_default(L, index, "range", def.range);
 116
 117         // Client shall immediately place this node when player places the item.
 118         // Server will update the precise end result a moment later.
 119         // "" = no prediction
 120         getstringfield(L, index, "node_placement_prediction",
 121                         def.node_placement_prediction);
 122 }
 123
 124 /******************************************************************************/
 125 void push_item_definition(lua_State *L, const ItemDefinition &i)
 126 {
 127         lua_newtable(L);
 128         lua_pushstring(L, i.name.c_str());
 129         lua_setfield(L, -2, "name");
 130         lua_pushstring(L, i.description.c_str());
 131         lua_setfield(L, -2, "description");
 132 }
 133
 134 void push_item_definition_full(lua_State *L, const ItemDefinition &i)
 135 {
 136         std::string type(es_ItemType[(int)i.type].str);
 137
 138         lua_newtable(L);
 139         lua_pushstring(L, i.name.c_str());
 140         lua_setfield(L, -2, "name");
 141         lua_pushstring(L, i.description.c_str());
 142         lua_setfield(L, -2, "description");
 143         lua_pushstring(L, type.c_str());
 144         lua_setfield(L, -2, "type");
 145         lua_pushstring(L, i.inventory_image.c_str());
 146         lua_setfield(L, -2, "inventory_image");
 147         lua_pushstring(L, i.inventory_overlay.c_str());
 148         lua_setfield(L, -2, "inventory_overlay");
 149         lua_pushstring(L, i.wield_image.c_str());
 150         lua_setfield(L, -2, "wield_image");
 151         lua_pushstring(L, i.wield_overlay.c_str());
 152         lua_setfield(L, -2, "wield_overlay");
 153         lua_pushstring(L, i.palette_image.c_str());
 154         lua_setfield(L, -2, "palette_image");
 155         push_ARGB8(L, i.color);
 156         lua_setfield(L, -2, "color");
 157         push_v3f(L, i.wield_scale);
 158         lua_setfield(L, -2, "wield_scale");
 159         lua_pushinteger(L, i.stack_max);
 160         lua_setfield(L, -2, "stack_max");
 161         lua_pushboolean(L, i.usable);
 162         lua_setfield(L, -2, "usable");
 163         lua_pushboolean(L, i.liquids_pointable);
 164         lua_setfield(L, -2, "liquids_pointable");
 165         if (i.type == ITEM_TOOL) {
 166                 push_tool_capabilities(L, ToolCapabilities(
 167                         i.tool_capabilities->full_punch_interval,
 168                         i.tool_capabilities->max_drop_level,
 169                         i.tool_capabilities->groupcaps,
 170                         i.tool_capabilities->damageGroups));
 171                 lua_setfield(L, -2, "tool_capabilities");
 172         }
 173         push_groups(L, i.groups);
 174         lua_setfield(L, -2, "groups");
 175         push_soundspec(L, i.sound_place);
 176         lua_setfield(L, -2, "sound_place");
 177         push_soundspec(L, i.sound_place_failed);
 178         lua_setfield(L, -2, "sound_place_failed");
 179         lua_pushstring(L, i.node_placement_prediction.c_str());
 180         lua_setfield(L, -2, "node_placement_prediction");
 181 }
 182
 183 /******************************************************************************/
 184 void read_object_properties(lua_State *L, int index,
 185                 ObjectProperties *prop, IItemDefManager *idef)
 186 {
 187         if(index < 0)
 188                 index = lua_gettop(L) + 1 + index;
 189         if(!lua_istable(L, index))
 190                 return;
 191
 192         int hp_max = 0;
 193         if (getintfield(L, -1, "hp_max", hp_max))
 194                 prop->hp_max = (u16)rangelim(hp_max, 0, U16_MAX);
 195
 196         getintfield(L, -1, "breath_max", prop->breath_max);
 197         getboolfield(L, -1, "physical", prop->physical);
 198         getboolfield(L, -1, "collide_with_objects", prop->collideWithObjects);
 199
 200         getfloatfield(L, -1, "weight", prop->weight);
 201
 202         lua_getfield(L, -1, "collisionbox");
 203         bool collisionbox_defined = lua_istable(L, -1);
 204         if (collisionbox_defined)
 205                 prop->collisionbox = read_aabb3f(L, -1, 1.0);
 206         lua_pop(L, 1);
 207
 208         lua_getfield(L, -1, "selectionbox");
 209         if (lua_istable(L, -1))
 210                 prop->selectionbox = read_aabb3f(L, -1, 1.0);
 211         else if (collisionbox_defined)
 212                 prop->selectionbox = prop->collisionbox;
 213         lua_pop(L, 1);
 214
 215         getboolfield(L, -1, "pointable", prop->pointable);
 216         getstringfield(L, -1, "visual", prop->visual);
 217
 218         getstringfield(L, -1, "mesh", prop->mesh);
 219
 220         lua_getfield(L, -1, "visual_size");
 221         if (lua_istable(L, -1)) {
 222                 // Backwards compatibility: Also accept { x = ?, y = ? }
 223                 v2f scale_xy = read_v2f(L, -1);
 224
 225                 f32 scale_z = scale_xy.X;
 226                 lua_getfield(L, -1, "z");
 227                 if (lua_isnumber(L, -1))
 228                         scale_z = lua_tonumber(L, -1);
 229                 lua_pop(L, 1);
 230
 231                 prop->visual_size = v3f(scale_xy.X, scale_xy.Y, scale_z);
 232         }
 233         lua_pop(L, 1);
 234
 235         lua_getfield(L, -1, "textures");
 236         if(lua_istable(L, -1)){
 237                 prop->textures.clear();
 238                 int table = lua_gettop(L);
 239                 lua_pushnil(L);
 240                 while(lua_next(L, table) != 0){
 241                         // key at index -2 and value at index -1
 242                         if(lua_isstring(L, -1))
 243                                 prop->textures.emplace_back(lua_tostring(L, -1));
 244                         else
 245                                 prop->textures.emplace_back("");
 246                         // removes value, keeps key for next iteration
 247                         lua_pop(L, 1);
 248                 }
 249         }
 250         lua_pop(L, 1);
 251
 252         lua_getfield(L, -1, "colors");
 253         if (lua_istable(L, -1)) {
 254                 int table = lua_gettop(L);
 255                 prop->colors.clear();
 256                 for (lua_pushnil(L); lua_next(L, table); lua_pop(L, 1)) {
 257                         video::SColor color(255, 255, 255, 255);
 258                         read_color(L, -1, &color);
 259                         prop->colors.push_back(color);
 260                 }
 261         }
 262         lua_pop(L, 1);
 263
 264         lua_getfield(L, -1, "spritediv");
 265         if(lua_istable(L, -1))
 266                 prop->spritediv = read_v2s16(L, -1);
 267         lua_pop(L, 1);
 268
 269         lua_getfield(L, -1, "initial_sprite_basepos");
 270         if(lua_istable(L, -1))
 271                 prop->initial_sprite_basepos = read_v2s16(L, -1);
 272         lua_pop(L, 1);
 273
 274         getboolfield(L, -1, "is_visible", prop->is_visible);
 275         getboolfield(L, -1, "makes_footstep_sound", prop->makes_footstep_sound);
 276         if (getfloatfield(L, -1, "stepheight", prop->stepheight))
 277                 prop->stepheight *= BS;
 278         getfloatfield(L, -1, "eye_height", prop->eye_height);
 279
 280         getfloatfield(L, -1, "automatic_rotate", prop->automatic_rotate);
 281         lua_getfield(L, -1, "automatic_face_movement_dir");
 282         if (lua_isnumber(L, -1)) {
 283                 prop->automatic_face_movement_dir = true;
 284                 prop->automatic_face_movement_dir_offset = luaL_checknumber(L, -1);
 285         } else if (lua_isboolean(L, -1)) {
 286                 prop->automatic_face_movement_dir = lua_toboolean(L, -1);
 287                 prop->automatic_face_movement_dir_offset = 0.0;
 288         }
 289         lua_pop(L, 1);
 290         getboolfield(L, -1, "backface_culling", prop->backface_culling);
 291         getintfield(L, -1, "glow", prop->glow);
 292
 293         getstringfield(L, -1, "nametag", prop->nametag);
 294         lua_getfield(L, -1, "nametag_color");
 295         if (!lua_isnil(L, -1)) {
 296                 video::SColor color = prop->nametag_color;
 297                 if (read_color(L, -1, &color))
 298                         prop->nametag_color = color;
 299         }
 300         lua_pop(L, 1);
 301
 302         lua_getfield(L, -1, "automatic_face_movement_max_rotation_per_sec");
 303         if (lua_isnumber(L, -1)) {
 304                 prop->automatic_face_movement_max_rotation_per_sec = luaL_checknumber(L, -1);
 305         }
 306         lua_pop(L, 1);
 307
 308         getstringfield(L, -1, "infotext", prop->infotext);
 309         getboolfield(L, -1, "static_save", prop->static_save);
 310
 311         lua_getfield(L, -1, "wield_item");
 312         if (!lua_isnil(L, -1))
 313                 prop->wield_item = read_item(L, -1, idef).getItemString();
 314         lua_pop(L, 1);
 315
 316         getfloatfield(L, -1, "zoom_fov", prop->zoom_fov);
 317         getboolfield(L, -1, "use_texture_alpha", prop->use_texture_alpha);
 318 }
 319
 320 /******************************************************************************/
 321 void push_object_properties(lua_State *L, ObjectProperties *prop)
 322 {
 323         lua_newtable(L);
 324         lua_pushnumber(L, prop->hp_max);
 325         lua_setfield(L, -2, "hp_max");
 326         lua_pushnumber(L, prop->breath_max);
 327         lua_setfield(L, -2, "breath_max");
 328         lua_pushboolean(L, prop->physical);
 329         lua_setfield(L, -2, "physical");
 330         lua_pushboolean(L, prop->collideWithObjects);
 331         lua_setfield(L, -2, "collide_with_objects");
 332         lua_pushnumber(L, prop->weight);
 333         lua_setfield(L, -2, "weight");
 334         push_aabb3f(L, prop->collisionbox);
 335         lua_setfield(L, -2, "collisionbox");
 336         push_aabb3f(L, prop->selectionbox);
 337         lua_setfield(L, -2, "selectionbox");
 338         lua_pushboolean(L, prop->pointable);
 339         lua_setfield(L, -2, "pointable");
 340         lua_pushlstring(L, prop->visual.c_str(), prop->visual.size());
 341         lua_setfield(L, -2, "visual");
 342         lua_pushlstring(L, prop->mesh.c_str(), prop->mesh.size());
 343         lua_setfield(L, -2, "mesh");
 344         push_v3f(L, prop->visual_size);
 345         lua_setfield(L, -2, "visual_size");
 346
 347         lua_newtable(L);
 348         u16 i = 1;
 349         for (const std::string &texture : prop->textures) {
 350                 lua_pushlstring(L, texture.c_str(), texture.size());
 351                 lua_rawseti(L, -2, i++);
 352         }
 353         lua_setfield(L, -2, "textures");
 354
 355         lua_newtable(L);
 356         i = 1;
 357         for (const video::SColor &color : prop->colors) {
 358                 push_ARGB8(L, color);
 359                 lua_rawseti(L, -2, i++);
 360         }
 361         lua_setfield(L, -2, "colors");
 362
 363         push_v2s16(L, prop->spritediv);
 364         lua_setfield(L, -2, "spritediv");
 365         push_v2s16(L, prop->initial_sprite_basepos);
 366         lua_setfield(L, -2, "initial_sprite_basepos");
 367         lua_pushboolean(L, prop->is_visible);
 368         lua_setfield(L, -2, "is_visible");
 369         lua_pushboolean(L, prop->makes_footstep_sound);
 370         lua_setfield(L, -2, "makes_footstep_sound");
 371         lua_pushnumber(L, prop->stepheight / BS);
 372         lua_setfield(L, -2, "stepheight");
 373         lua_pushnumber(L, prop->eye_height);
 374         lua_setfield(L, -2, "eye_height");
 375         lua_pushnumber(L, prop->automatic_rotate);
 376         lua_setfield(L, -2, "automatic_rotate");
 377         if (prop->automatic_face_movement_dir)
 378                 lua_pushnumber(L, prop->automatic_face_movement_dir_offset);
 379         else
 380                 lua_pushboolean(L, false);
 381         lua_setfield(L, -2, "automatic_face_movement_dir");
 382         lua_pushboolean(L, prop->backface_culling);
 383         lua_setfield(L, -2, "backface_culling");
 384         lua_pushnumber(L, prop->glow);
 385         lua_setfield(L, -2, "glow");
 386         lua_pushlstring(L, prop->nametag.c_str(), prop->nametag.size());
 387         lua_setfield(L, -2, "nametag");
 388         push_ARGB8(L, prop->nametag_color);
 389         lua_setfield(L, -2, "nametag_color");
 390         lua_pushnumber(L, prop->automatic_face_movement_max_rotation_per_sec);
 391         lua_setfield(L, -2, "automatic_face_movement_max_rotation_per_sec");
 392         lua_pushlstring(L, prop->infotext.c_str(), prop->infotext.size());
 393         lua_setfield(L, -2, "infotext");
 394         lua_pushboolean(L, prop->static_save);
 395         lua_setfield(L, -2, "static_save");
 396         lua_pushlstring(L, prop->wield_item.c_str(), prop->wield_item.size());
 397         lua_setfield(L, -2, "wield_item");
 398         lua_pushnumber(L, prop->zoom_fov);
 399         lua_setfield(L, -2, "zoom_fov");
 400         lua_pushboolean(L, prop->use_texture_alpha);
 401         lua_setfield(L, -2, "use_texture_alpha");
 402 }
 403
 404 /******************************************************************************/
 405 TileDef read_tiledef(lua_State *L, int index, u8 drawtype)
 406 {
 407         if(index < 0)
 408                 index = lua_gettop(L) + 1 + index;
 409
 410         TileDef tiledef;
 411
 412         bool default_tiling = true;
 413         bool default_culling = true;
 414         switch (drawtype) {
 415                 case NDT_PLANTLIKE:
 416                 case NDT_PLANTLIKE_ROOTED:
 417                 case NDT_FIRELIKE:
 418                         default_tiling = false;
 419                         // "break" is omitted here intentionaly, as PLANTLIKE
 420                         // FIRELIKE drawtype both should default to having
 421                         // backface_culling to false.
 422                 case NDT_MESH:
 423                 case NDT_LIQUID:
 424                         default_culling = false;
 425                         break;
 426                 default:
 427                         break;
 428         }
 429
 430         // key at index -2 and value at index
 431         if(lua_isstring(L, index)){
 432                 // "default_lava.png"
 433                 tiledef.name = lua_tostring(L, index);
 434                 tiledef.tileable_vertical = default_tiling;
 435                 tiledef.tileable_horizontal = default_tiling;
 436                 tiledef.backface_culling = default_culling;
 437         }
 438         else if(lua_istable(L, index))
 439         {
 440                 // name="default_lava.png"
 441                 tiledef.name = "";
 442                 getstringfield(L, index, "name", tiledef.name);
 443                 getstringfield(L, index, "image", tiledef.name); // MaterialSpec compat.
 444                 tiledef.backface_culling = getboolfield_default(
 445                         L, index, "backface_culling", default_culling);
 446                 tiledef.tileable_horizontal = getboolfield_default(
 447                         L, index, "tileable_horizontal", default_tiling);
 448                 tiledef.tileable_vertical = getboolfield_default(
 449                         L, index, "tileable_vertical", default_tiling);
 450                 std::string align_style;
 451                 if (getstringfield(L, index, "align_style", align_style)) {
 452                         if (align_style == "user")
 453                                 tiledef.align_style = ALIGN_STYLE_USER_DEFINED;
 454                         else if (align_style == "world")
 455                                 tiledef.align_style = ALIGN_STYLE_WORLD;
 456                         else
 457                                 tiledef.align_style = ALIGN_STYLE_NODE;
 458                 }
 459                 tiledef.scale = getintfield_default(L, index, "scale", 0);
 460                 // color = ...
 461                 lua_getfield(L, index, "color");
 462                 tiledef.has_color = read_color(L, -1, &tiledef.color);
 463                 lua_pop(L, 1);
 464                 // animation = {}
 465                 lua_getfield(L, index, "animation");
 466                 tiledef.animation = read_animation_definition(L, -1);
 467                 lua_pop(L, 1);
 468         }
 469
 470         return tiledef;
 471 }
 472
 473 /******************************************************************************/
 474 ContentFeatures read_content_features(lua_State *L, int index)
 475 {
 476         if(index < 0)
 477                 index = lua_gettop(L) + 1 + index;
 478
 479         ContentFeatures f;
 480
 481         /* Cache existence of some callbacks */
 482         lua_getfield(L, index, "on_construct");
 483         if(!lua_isnil(L, -1)) f.has_on_construct = true;
 484         lua_pop(L, 1);
 485         lua_getfield(L, index, "on_destruct");
 486         if(!lua_isnil(L, -1)) f.has_on_destruct = true;
 487         lua_pop(L, 1);
 488         lua_getfield(L, index, "after_destruct");
 489         if(!lua_isnil(L, -1)) f.has_after_destruct = true;
 490         lua_pop(L, 1);
 491
 492         lua_getfield(L, index, "on_rightclick");
 493         f.rightclickable = lua_isfunction(L, -1);
 494         lua_pop(L, 1);
 495
 496         /* Name */
 497         getstringfield(L, index, "name", f.name);
 498
 499         /* Groups */
 500         lua_getfield(L, index, "groups");
 501         read_groups(L, -1, f.groups);
 502         lua_pop(L, 1);
 503
 504         /* Visual definition */
 505
 506         f.drawtype = (NodeDrawType)getenumfield(L, index, "drawtype",
 507                         ScriptApiNode::es_DrawType,NDT_NORMAL);
 508         getfloatfield(L, index, "visual_scale", f.visual_scale);
 509
 510         /* Meshnode model filename */
 511         getstringfield(L, index, "mesh", f.mesh);
 512
 513         // tiles = {}
 514         lua_getfield(L, index, "tiles");
 515         // If nil, try the deprecated name "tile_images" instead
 516         if(lua_isnil(L, -1)){
 517                 lua_pop(L, 1);
 518                 warn_if_field_exists(L, index, "tile_images",
 519                                 "Deprecated; new name is \"tiles\".");
 520                 lua_getfield(L, index, "tile_images");
 521         }
 522         if(lua_istable(L, -1)){
 523                 int table = lua_gettop(L);
 524                 lua_pushnil(L);
 525                 int i = 0;
 526                 while(lua_next(L, table) != 0){
 527                         // Read tiledef from value
 528                         f.tiledef[i] = read_tiledef(L, -1, f.drawtype);
 529                         // removes value, keeps key for next iteration
 530                         lua_pop(L, 1);
 531                         i++;
 532                         if(i==6){
 533                                 lua_pop(L, 1);
 534                                 break;
 535                         }
 536                 }
 537                 // Copy last value to all remaining textures
 538                 if(i >= 1){
 539                         TileDef lasttile = f.tiledef[i-1];
 540                         while(i < 6){
 541                                 f.tiledef[i] = lasttile;
 542                                 i++;
 543                         }
 544                 }
 545         }
 546         lua_pop(L, 1);
 547
 548         // overlay_tiles = {}
 549         lua_getfield(L, index, "overlay_tiles");
 550         if (lua_istable(L, -1)) {
 551                 int table = lua_gettop(L);
 552                 lua_pushnil(L);
 553                 int i = 0;
 554                 while (lua_next(L, table) != 0) {
 555                         // Read tiledef from value
 556                         f.tiledef_overlay[i] = read_tiledef(L, -1, f.drawtype);
 557                         // removes value, keeps key for next iteration
 558                         lua_pop(L, 1);
 559                         i++;
 560                         if (i == 6) {
 561                                 lua_pop(L, 1);
 562                                 break;
 563                         }
 564                 }
 565                 // Copy last value to all remaining textures
 566                 if (i >= 1) {
 567                         TileDef lasttile = f.tiledef_overlay[i - 1];
 568                         while (i < 6) {
 569                                 f.tiledef_overlay[i] = lasttile;
 570                                 i++;
 571                         }
 572                 }
 573         }
 574         lua_pop(L, 1);
 575
 576         // special_tiles = {}
 577         lua_getfield(L, index, "special_tiles");
 578         // If nil, try the deprecated name "special_materials" instead
 579         if(lua_isnil(L, -1)){
 580                 lua_pop(L, 1);
 581                 warn_if_field_exists(L, index, "special_materials",
 582                                 "Deprecated; new name is \"special_tiles\".");
 583                 lua_getfield(L, index, "special_materials");
 584         }
 585         if(lua_istable(L, -1)){
 586                 int table = lua_gettop(L);
 587                 lua_pushnil(L);
 588                 int i = 0;
 589                 while(lua_next(L, table) != 0){
 590                         // Read tiledef from value
 591                         f.tiledef_special[i] = read_tiledef(L, -1, f.drawtype);
 592                         // removes value, keeps key for next iteration
 593                         lua_pop(L, 1);
 594                         i++;
 595                         if(i==CF_SPECIAL_COUNT){
 596                                 lua_pop(L, 1);
 597                                 break;
 598                         }
 599                 }
 600         }
 601         lua_pop(L, 1);
 602
 603         f.alpha = getintfield_default(L, index, "alpha", 255);
 604
 605         bool usealpha = getboolfield_default(L, index,
 606                         "use_texture_alpha", false);
 607         if (usealpha)
 608                 f.alpha = 0;
 609
 610         // Read node color.
 611         lua_getfield(L, index, "color");
 612         read_color(L, -1, &f.color);
 613         lua_pop(L, 1);
 614
 615         getstringfield(L, index, "palette", f.palette_name);
 616
 617         /* Other stuff */
 618
 619         lua_getfield(L, index, "post_effect_color");
 620         read_color(L, -1, &f.post_effect_color);
 621         lua_pop(L, 1);
 622
 623         f.param_type = (ContentParamType)getenumfield(L, index, "paramtype",
 624                         ScriptApiNode::es_ContentParamType, CPT_NONE);
 625         f.param_type_2 = (ContentParamType2)getenumfield(L, index, "paramtype2",
 626                         ScriptApiNode::es_ContentParamType2, CPT2_NONE);
 627
 628         if (!f.palette_name.empty() &&
 629                         !(f.param_type_2 == CPT2_COLOR ||
 630                         f.param_type_2 == CPT2_COLORED_FACEDIR ||
 631                         f.param_type_2 == CPT2_COLORED_WALLMOUNTED))
 632                 warningstream << "Node " << f.name.c_str()
 633                         << " has a palette, but not a suitable paramtype2." << std::endl;
 634
 635         // Warn about some deprecated fields
 636         warn_if_field_exists(L, index, "wall_mounted",
 637                         "Deprecated; use paramtype2 = 'wallmounted'");
 638         warn_if_field_exists(L, index, "light_propagates",
 639                         "Deprecated; determined from paramtype");
 640         warn_if_field_exists(L, index, "dug_item",
 641                         "Deprecated; use 'drop' field");
 642         warn_if_field_exists(L, index, "extra_dug_item",
 643                         "Deprecated; use 'drop' field");
 644         warn_if_field_exists(L, index, "extra_dug_item_rarity",
 645                         "Deprecated; use 'drop' field");
 646         warn_if_field_exists(L, index, "metadata_name",
 647                         "Deprecated; use on_add and metadata callbacks");
 648
 649         // True for all ground-like things like stone and mud, false for eg. trees
 650         getboolfield(L, index, "is_ground_content", f.is_ground_content);
 651         f.light_propagates = (f.param_type == CPT_LIGHT);
 652         getboolfield(L, index, "sunlight_propagates", f.sunlight_propagates);
 653         // This is used for collision detection.
 654         // Also for general solidness queries.
 655         getboolfield(L, index, "walkable", f.walkable);
 656         // Player can point to these
 657         getboolfield(L, index, "pointable", f.pointable);
 658         // Player can dig these
 659         getboolfield(L, index, "diggable", f.diggable);
 660         // Player can climb these
 661         getboolfield(L, index, "climbable", f.climbable);
 662         // Player can build on these
 663         getboolfield(L, index, "buildable_to", f.buildable_to);
 664         // Liquids flow into and replace node
 665         getboolfield(L, index, "floodable", f.floodable);
 666         // Whether the node is non-liquid, source liquid or flowing liquid
 667         f.liquid_type = (LiquidType)getenumfield(L, index, "liquidtype",
 668                         ScriptApiNode::es_LiquidType, LIQUID_NONE);
 669         // If the content is liquid, this is the flowing version of the liquid.
 670         getstringfield(L, index, "liquid_alternative_flowing",
 671                         f.liquid_alternative_flowing);
 672         // If the content is liquid, this is the source version of the liquid.
 673         getstringfield(L, index, "liquid_alternative_source",
 674                         f.liquid_alternative_source);
 675         // Viscosity for fluid flow, ranging from 1 to 7, with
 676         // 1 giving almost instantaneous propagation and 7 being
 677         // the slowest possible
 678         f.liquid_viscosity = getintfield_default(L, index,
 679                         "liquid_viscosity", f.liquid_viscosity);
 680         f.liquid_range = getintfield_default(L, index,
 681                         "liquid_range", f.liquid_range);
 682         f.leveled = getintfield_default(L, index, "leveled", f.leveled);
 683
 684         getboolfield(L, index, "liquid_renewable", f.liquid_renewable);
 685         f.drowning = getintfield_default(L, index,
 686                         "drowning", f.drowning);
 687         // Amount of light the node emits
 688         f.light_source = getintfield_default(L, index,
 689                         "light_source", f.light_source);
 690         if (f.light_source > LIGHT_MAX) {
 691                 warningstream << "Node " << f.name.c_str()
 692                         << " had greater light_source than " << LIGHT_MAX
 693                         << ", it was reduced." << std::endl;
 694                 f.light_source = LIGHT_MAX;
 695         }
 696         f.damage_per_second = getintfield_default(L, index,
 697                         "damage_per_second", f.damage_per_second);
 698
 699         lua_getfield(L, index, "node_box");
 700         if(lua_istable(L, -1))
 701                 f.node_box = read_nodebox(L, -1);
 702         lua_pop(L, 1);
 703
 704         lua_getfield(L, index, "connects_to");
 705         if (lua_istable(L, -1)) {
 706                 int table = lua_gettop(L);
 707                 lua_pushnil(L);
 708                 while (lua_next(L, table) != 0) {
 709                         // Value at -1
 710                         f.connects_to.emplace_back(lua_tostring(L, -1));
 711                         lua_pop(L, 1);
 712                 }
 713         }
 714         lua_pop(L, 1);
 715
 716         lua_getfield(L, index, "connect_sides");
 717         if (lua_istable(L, -1)) {
 718                 int table = lua_gettop(L);
 719                 lua_pushnil(L);
 720                 while (lua_next(L, table) != 0) {
 721                         // Value at -1
 722                         std::string side(lua_tostring(L, -1));
 723                         // Note faces are flipped to make checking easier
 724                         if (side == "top")
 725                                 f.connect_sides |= 2;
 726                         else if (side == "bottom")
 727                                 f.connect_sides |= 1;
 728                         else if (side == "front")
 729                                 f.connect_sides |= 16;
 730                         else if (side == "left")
 731                                 f.connect_sides |= 32;
 732                         else if (side == "back")
 733                                 f.connect_sides |= 4;
 734                         else if (side == "right")
 735                                 f.connect_sides |= 8;
 736                         else
 737                                 warningstream << "Unknown value for \"connect_sides\": "
 738                                         << side << std::endl;
 739                         lua_pop(L, 1);
 740                 }
 741         }
 742         lua_pop(L, 1);
 743
 744         lua_getfield(L, index, "selection_box");
 745         if(lua_istable(L, -1))
 746                 f.selection_box = read_nodebox(L, -1);
 747         lua_pop(L, 1);
 748
 749         lua_getfield(L, index, "collision_box");
 750         if(lua_istable(L, -1))
 751                 f.collision_box = read_nodebox(L, -1);
 752         lua_pop(L, 1);
 753
 754         f.waving = getintfield_default(L, index,
 755                         "waving", f.waving);
 756
 757         // Set to true if paramtype used to be 'facedir_simple'
 758         getboolfield(L, index, "legacy_facedir_simple", f.legacy_facedir_simple);
 759         // Set to true if wall_mounted used to be set to true
 760         getboolfield(L, index, "legacy_wallmounted", f.legacy_wallmounted);
 761
 762         // Sound table
 763         lua_getfield(L, index, "sounds");
 764         if(lua_istable(L, -1)){
 765                 lua_getfield(L, -1, "footstep");
 766                 read_soundspec(L, -1, f.sound_footstep);
 767                 lua_pop(L, 1);
 768                 lua_getfield(L, -1, "dig");
 769                 read_soundspec(L, -1, f.sound_dig);
 770                 lua_pop(L, 1);
 771                 lua_getfield(L, -1, "dug");
 772                 read_soundspec(L, -1, f.sound_dug);
 773                 lua_pop(L, 1);
 774         }
 775         lua_pop(L, 1);
 776
 777         // Node immediately placed by client when node is dug
 778         getstringfield(L, index, "node_dig_prediction",
 779                 f.node_dig_prediction);
 780
 781         return f;
 782 }
 783
 784 void push_content_features(lua_State *L, const ContentFeatures &c)
 785 {
 786         std::string paramtype(ScriptApiNode::es_ContentParamType[(int)c.param_type].str);
 787         std::string paramtype2(ScriptApiNode::es_ContentParamType2[(int)c.param_type_2].str);
 788         std::string drawtype(ScriptApiNode::es_DrawType[(int)c.drawtype].str);
 789         std::string liquid_type(ScriptApiNode::es_LiquidType[(int)c.liquid_type].str);
 790
 791         /* Missing "tiles" because I don't see a usecase (at least not yet). */
 792
 793         lua_newtable(L);
 794         lua_pushboolean(L, c.has_on_construct);
 795         lua_setfield(L, -2, "has_on_construct");
 796         lua_pushboolean(L, c.has_on_destruct);
 797         lua_setfield(L, -2, "has_on_destruct");
 798         lua_pushboolean(L, c.has_after_destruct);
 799         lua_setfield(L, -2, "has_after_destruct");
 800         lua_pushstring(L, c.name.c_str());
 801         lua_setfield(L, -2, "name");
 802         push_groups(L, c.groups);
 803         lua_setfield(L, -2, "groups");
 804         lua_pushstring(L, paramtype.c_str());
 805         lua_setfield(L, -2, "paramtype");
 806         lua_pushstring(L, paramtype2.c_str());
 807         lua_setfield(L, -2, "paramtype2");
 808         lua_pushstring(L, drawtype.c_str());
 809         lua_setfield(L, -2, "drawtype");
 810         if (!c.mesh.empty()) {
 811                 lua_pushstring(L, c.mesh.c_str());
 812                 lua_setfield(L, -2, "mesh");
 813         }
 814 #ifndef SERVER
 815         push_ARGB8(L, c.minimap_color);       // I know this is not set-able w/ register_node,
 816         lua_setfield(L, -2, "minimap_color"); // but the people need to know!
 817 #endif
 818         lua_pushnumber(L, c.visual_scale);
 819         lua_setfield(L, -2, "visual_scale");
 820         lua_pushnumber(L, c.alpha);
 821         lua_setfield(L, -2, "alpha");
 822         if (!c.palette_name.empty()) {
 823                 push_ARGB8(L, c.color);
 824                 lua_setfield(L, -2, "color");
 825
 826                 lua_pushstring(L, c.palette_name.c_str());
 827                 lua_setfield(L, -2, "palette_name");
 828
 829                 push_palette(L, c.palette);
 830                 lua_setfield(L, -2, "palette");
 831         }
 832         lua_pushnumber(L, c.waving);
 833         lua_setfield(L, -2, "waving");
 834         lua_pushnumber(L, c.connect_sides);
 835         lua_setfield(L, -2, "connect_sides");
 836
 837         lua_newtable(L);
 838         u16 i = 1;
 839         for (const std::string &it : c.connects_to) {
 840                 lua_pushlstring(L, it.c_str(), it.size());
 841                 lua_rawseti(L, -2, i++);
 842         }
 843         lua_setfield(L, -2, "connects_to");
 844
 845         push_ARGB8(L, c.post_effect_color);
 846         lua_setfield(L, -2, "post_effect_color");
 847         lua_pushnumber(L, c.leveled);
 848         lua_setfield(L, -2, "leveled");
 849         lua_pushboolean(L, c.sunlight_propagates);
 850         lua_setfield(L, -2, "sunlight_propagates");
 851         lua_pushnumber(L, c.light_source);
 852         lua_setfield(L, -2, "light_source");
 853         lua_pushboolean(L, c.is_ground_content);
 854         lua_setfield(L, -2, "is_ground_content");
 855         lua_pushboolean(L, c.walkable);
 856         lua_setfield(L, -2, "walkable");
 857         lua_pushboolean(L, c.pointable);
 858         lua_setfield(L, -2, "pointable");
 859         lua_pushboolean(L, c.diggable);
 860         lua_setfield(L, -2, "diggable");
 861         lua_pushboolean(L, c.climbable);
 862         lua_setfield(L, -2, "climbable");
 863         lua_pushboolean(L, c.buildable_to);
 864         lua_setfield(L, -2, "buildable_to");
 865         lua_pushboolean(L, c.rightclickable);
 866         lua_setfield(L, -2, "rightclickable");
 867         lua_pushnumber(L, c.damage_per_second);
 868         lua_setfield(L, -2, "damage_per_second");
 869         if (c.isLiquid()) {
 870                 lua_pushstring(L, liquid_type.c_str());
 871                 lua_setfield(L, -2, "liquid_type");
 872                 lua_pushstring(L, c.liquid_alternative_flowing.c_str());
 873                 lua_setfield(L, -2, "liquid_alternative_flowing");
 874                 lua_pushstring(L, c.liquid_alternative_source.c_str());
 875                 lua_setfield(L, -2, "liquid_alternative_source");
 876                 lua_pushnumber(L, c.liquid_viscosity);
 877                 lua_setfield(L, -2, "liquid_viscosity");
 878                 lua_pushboolean(L, c.liquid_renewable);
 879                 lua_setfield(L, -2, "liquid_renewable");
 880                 lua_pushnumber(L, c.liquid_range);
 881                 lua_setfield(L, -2, "liquid_range");
 882         }
 883         lua_pushnumber(L, c.drowning);
 884         lua_setfield(L, -2, "drowning");
 885         lua_pushboolean(L, c.floodable);
 886         lua_setfield(L, -2, "floodable");
 887         push_nodebox(L, c.node_box);
 888         lua_setfield(L, -2, "node_box");
 889         push_nodebox(L, c.selection_box);
 890         lua_setfield(L, -2, "selection_box");
 891         push_nodebox(L, c.collision_box);
 892         lua_setfield(L, -2, "collision_box");
 893         lua_newtable(L);
 894         push_soundspec(L, c.sound_footstep);
 895         lua_setfield(L, -2, "sound_footstep");
 896         push_soundspec(L, c.sound_dig);
 897         lua_setfield(L, -2, "sound_dig");
 898         push_soundspec(L, c.sound_dug);
 899         lua_setfield(L, -2, "sound_dug");
 900         lua_setfield(L, -2, "sounds");
 901         lua_pushboolean(L, c.legacy_facedir_simple);
 902         lua_setfield(L, -2, "legacy_facedir_simple");
 903         lua_pushboolean(L, c.legacy_wallmounted);
 904         lua_setfield(L, -2, "legacy_wallmounted");
 905         lua_pushstring(L, c.node_dig_prediction.c_str());
 906         lua_setfield(L, -2, "node_dig_prediction");
 907 }
 908
 909 /******************************************************************************/
 910 void push_nodebox(lua_State *L, const NodeBox &box)
 911 {
 912         lua_newtable(L);
 913         switch (box.type)
 914         {
 915                 case NODEBOX_REGULAR:
 916                         lua_pushstring(L, "regular");
 917                         lua_setfield(L, -2, "type");
 918                         break;
 919                 case NODEBOX_LEVELED:
 920                 case NODEBOX_FIXED:
 921                         lua_pushstring(L, "fixed");
 922                         lua_setfield(L, -2, "type");
 923                         push_box(L, box.fixed);
 924                         lua_setfield(L, -2, "fixed");
 925                         break;
 926                 case NODEBOX_WALLMOUNTED:
 927                         lua_pushstring(L, "wallmounted");
 928                         lua_setfield(L, -2, "type");
 929                         push_aabb3f(L, box.wall_top);
 930                         lua_setfield(L, -2, "wall_top");
 931                         push_aabb3f(L, box.wall_bottom);
 932                         lua_setfield(L, -2, "wall_bottom");
 933                         push_aabb3f(L, box.wall_side);
 934                         lua_setfield(L, -2, "wall_side");
 935                         break;
 936                 case NODEBOX_CONNECTED:
 937                         lua_pushstring(L, "connected");
 938                         lua_setfield(L, -2, "type");
 939                         push_box(L, box.connect_top);
 940                         lua_setfield(L, -2, "connect_top");
 941                         push_box(L, box.connect_bottom);
 942                         lua_setfield(L, -2, "connect_bottom");
 943                         push_box(L, box.connect_front);
 944                         lua_setfield(L, -2, "connect_front");
 945                         push_box(L, box.connect_back);
 946                         lua_setfield(L, -2, "connect_back");
 947                         push_box(L, box.connect_left);
 948                         lua_setfield(L, -2, "connect_left");
 949                         push_box(L, box.connect_right);
 950                         lua_setfield(L, -2, "connect_right");
 951                         break;
 952                 default:
 953                         FATAL_ERROR("Invalid box.type");
 954                         break;
 955         }
 956 }
 957
 958 void push_box(lua_State *L, const std::vector<aabb3f> &box)
 959 {
 960         lua_newtable(L);
 961         u8 i = 1;
 962         for (const aabb3f &it : box) {
 963                 push_aabb3f(L, it);
 964                 lua_rawseti(L, -2, i++);
 965         }
 966 }
 967
 968 /******************************************************************************/
 969 void push_palette(lua_State *L, const std::vector<video::SColor> *palette)
 970 {
 971         lua_createtable(L, palette->size(), 0);
 972         int newTable = lua_gettop(L);
 973         int index = 1;
 974         std::vector<video::SColor>::const_iterator iter;
 975         for (iter = palette->begin(); iter != palette->end(); ++iter) {
 976                 push_ARGB8(L, (*iter));
 977                 lua_rawseti(L, newTable, index);
 978                 index++;
 979         }
 980 }
 981
 982 /******************************************************************************/
 983 void read_server_sound_params(lua_State *L, int index,
 984                 ServerSoundParams &params)
 985 {
 986         if(index < 0)
 987                 index = lua_gettop(L) + 1 + index;
 988         // Clear
 989         params = ServerSoundParams();
 990         if(lua_istable(L, index)){
 991                 getfloatfield(L, index, "gain", params.gain);
 992                 getstringfield(L, index, "to_player", params.to_player);
 993                 getfloatfield(L, index, "fade", params.fade);
 994                 getfloatfield(L, index, "pitch", params.pitch);
 995                 lua_getfield(L, index, "pos");
 996                 if(!lua_isnil(L, -1)){
 997                         v3f p = read_v3f(L, -1)*BS;
 998                         params.pos = p;
 999                         params.type = ServerSoundParams::SSP_POSITIONAL;
1000                 }
1001                 lua_pop(L, 1);
1002                 lua_getfield(L, index, "object");
1003                 if(!lua_isnil(L, -1)){
1004                         ObjectRef *ref = ObjectRef::checkobject(L, -1);
1005                         ServerActiveObject *sao = ObjectRef::getobject(ref);
1006                         if(sao){
1007                                 params.object = sao->getId();
1008                                 params.type = ServerSoundParams::SSP_OBJECT;
1009                         }
1010                 }
1011                 lua_pop(L, 1);
1012                 params.max_hear_distance = BS*getfloatfield_default(L, index,
1013                                 "max_hear_distance", params.max_hear_distance/BS);
1014                 getboolfield(L, index, "loop", params.loop);
1015         }
1016 }
1017
1018 /******************************************************************************/
1019 void read_soundspec(lua_State *L, int index, SimpleSoundSpec &spec)
1020 {
1021         if(index < 0)
1022                 index = lua_gettop(L) + 1 + index;
1023         if(lua_isnil(L, index)){
1024         } else if(lua_istable(L, index)){
1025                 getstringfield(L, index, "name", spec.name);
1026                 getfloatfield(L, index, "gain", spec.gain);
1027                 getfloatfield(L, index, "fade", spec.fade);
1028                 getfloatfield(L, index, "pitch", spec.pitch);
1029         } else if(lua_isstring(L, index)){
1030                 spec.name = lua_tostring(L, index);
1031         }
1032 }
1033
1034 void push_soundspec(lua_State *L, const SimpleSoundSpec &spec)
1035 {
1036         lua_newtable(L);
1037         lua_pushstring(L, spec.name.c_str());
1038         lua_setfield(L, -2, "name");
1039         lua_pushnumber(L, spec.gain);
1040         lua_setfield(L, -2, "gain");
1041         lua_pushnumber(L, spec.fade);
1042         lua_setfield(L, -2, "fade");
1043         lua_pushnumber(L, spec.pitch);
1044         lua_setfield(L, -2, "pitch");
1045 }
1046
1047 /******************************************************************************/
1048 NodeBox read_nodebox(lua_State *L, int index)
1049 {
1050         NodeBox nodebox;
1051         if(lua_istable(L, -1)){
1052                 nodebox.type = (NodeBoxType)getenumfield(L, index, "type",
1053                                 ScriptApiNode::es_NodeBoxType, NODEBOX_REGULAR);
1054
1055 #define NODEBOXREAD(n, s){ \
1056                 lua_getfield(L, index, (s)); \
1057                 if (lua_istable(L, -1)) \
1058                         (n) = read_aabb3f(L, -1, BS); \
1059                 lua_pop(L, 1); \
1060         }
1061
1062 #define NODEBOXREADVEC(n, s) \
1063                 lua_getfield(L, index, (s)); \
1064                 if (lua_istable(L, -1)) \
1065                         (n) = read_aabb3f_vector(L, -1, BS); \
1066                 lua_pop(L, 1);
1067
1068                 NODEBOXREADVEC(nodebox.fixed, "fixed");
1069                 NODEBOXREAD(nodebox.wall_top, "wall_top");
1070                 NODEBOXREAD(nodebox.wall_bottom, "wall_bottom");
1071                 NODEBOXREAD(nodebox.wall_side, "wall_side");
1072                 NODEBOXREADVEC(nodebox.connect_top, "connect_top");
1073                 NODEBOXREADVEC(nodebox.connect_bottom, "connect_bottom");
1074                 NODEBOXREADVEC(nodebox.connect_front, "connect_front");
1075                 NODEBOXREADVEC(nodebox.connect_left, "connect_left");
1076                 NODEBOXREADVEC(nodebox.connect_back, "connect_back");
1077                 NODEBOXREADVEC(nodebox.connect_right, "connect_right");
1078                 NODEBOXREADVEC(nodebox.disconnected_top, "disconnected_top");
1079                 NODEBOXREADVEC(nodebox.disconnected_bottom, "disconnected_bottom");
1080                 NODEBOXREADVEC(nodebox.disconnected_front, "disconnected_front");
1081                 NODEBOXREADVEC(nodebox.disconnected_left, "disconnected_left");
1082                 NODEBOXREADVEC(nodebox.disconnected_back, "disconnected_back");
1083                 NODEBOXREADVEC(nodebox.disconnected_right, "disconnected_right");
1084                 NODEBOXREADVEC(nodebox.disconnected, "disconnected");
1085                 NODEBOXREADVEC(nodebox.disconnected_sides, "disconnected_sides");
1086         }
1087         return nodebox;
1088 }
1089
1090 /******************************************************************************/
1091 MapNode readnode(lua_State *L, int index, const NodeDefManager *ndef)
1092 {
1093         lua_getfield(L, index, "name");
1094         if (!lua_isstring(L, -1))
1095                 throw LuaError("Node name is not set or is not a string!");
1096         const char *name = lua_tostring(L, -1);
1097         lua_pop(L, 1);
1098
1099         u8 param1 = 0;
1100         lua_getfield(L, index, "param1");
1101         if (!lua_isnil(L, -1))
1102                 param1 = lua_tonumber(L, -1);
1103         lua_pop(L, 1);
1104
1105         u8 param2 = 0;
1106         lua_getfield(L, index, "param2");
1107         if (!lua_isnil(L, -1))
1108                 param2 = lua_tonumber(L, -1);
1109         lua_pop(L, 1);
1110
1111         return {ndef, name, param1, param2};
1112 }
1113
1114 /******************************************************************************/
1115 void pushnode(lua_State *L, const MapNode &n, const NodeDefManager *ndef)
1116 {
1117         lua_newtable(L);
1118         lua_pushstring(L, ndef->get(n).name.c_str());
1119         lua_setfield(L, -2, "name");
1120         lua_pushnumber(L, n.getParam1());
1121         lua_setfield(L, -2, "param1");
1122         lua_pushnumber(L, n.getParam2());
1123         lua_setfield(L, -2, "param2");
1124 }
1125
1126 /******************************************************************************/
1127 void warn_if_field_exists(lua_State *L, int table,
1128                 const char *name, const std::string &message)
1129 {
1130         lua_getfield(L, table, name);
1131         if (!lua_isnil(L, -1)) {
1132                 warningstream << "Field \"" << name << "\": "
1133                                 << message << std::endl;
1134                 infostream << script_get_backtrace(L) << std::endl;
1135         }
1136         lua_pop(L, 1);
1137 }
1138
1139 /******************************************************************************/
1140 int getenumfield(lua_State *L, int table,
1141                 const char *fieldname, const EnumString *spec, int default_)
1142 {
1143         int result = default_;
1144         string_to_enum(spec, result,
1145                         getstringfield_default(L, table, fieldname, ""));
1146         return result;
1147 }
1148
1149 /******************************************************************************/
1150 bool string_to_enum(const EnumString *spec, int &result,
1151                 const std::string &str)
1152 {
1153         const EnumString *esp = spec;
1154         while(esp->str){
1155                 if(str == std::string(esp->str)){
1156                         result = esp->num;
1157                         return true;
1158                 }
1159                 esp++;
1160         }
1161         return false;
1162 }
1163
1164 /******************************************************************************/
1165 ItemStack read_item(lua_State* L, int index, IItemDefManager *idef)
1166 {
1167         if(index < 0)
1168                 index = lua_gettop(L) + 1 + index;
1169
1170         if (lua_isnil(L, index)) {
1171                 return ItemStack();
1172         }
1173
1174         if (lua_isuserdata(L, index)) {
1175                 // Convert from LuaItemStack
1176                 LuaItemStack *o = LuaItemStack::checkobject(L, index);
1177                 return o->getItem();
1178         }
1179
1180         if (lua_isstring(L, index)) {
1181                 // Convert from itemstring
1182                 std::string itemstring = lua_tostring(L, index);
1183                 try
1184                 {
1185                         ItemStack item;
1186                         item.deSerialize(itemstring, idef);
1187                         return item;
1188                 }
1189                 catch(SerializationError &e)
1190                 {
1191                         warningstream<<"unable to create item from itemstring"
1192                                         <<": "<<itemstring<<std::endl;
1193                         return ItemStack();
1194                 }
1195         }
1196         else if(lua_istable(L, index))
1197         {
1198                 // Convert from table
1199                 std::string name = getstringfield_default(L, index, "name", "");
1200                 int count = getintfield_default(L, index, "count", 1);
1201                 int wear = getintfield_default(L, index, "wear", 0);
1202
1203                 ItemStack istack(name, count, wear, idef);
1204
1205                 // BACKWARDS COMPATIBLITY
1206                 std::string value = getstringfield_default(L, index, "metadata", "");
1207                 istack.metadata.setString("", value);
1208
1209                 // Get meta
1210                 lua_getfield(L, index, "meta");
1211                 int fieldstable = lua_gettop(L);
1212                 if (lua_istable(L, fieldstable)) {
1213                         lua_pushnil(L);
1214                         while (lua_next(L, fieldstable) != 0) {
1215                                 // key at index -2 and value at index -1
1216                                 std::string key = lua_tostring(L, -2);
1217                                 size_t value_len;
1218                                 const char *value_cs = lua_tolstring(L, -1, &value_len);
1219                                 std::string value(value_cs, value_len);
1220                                 istack.metadata.setString(key, value);
1221                                 lua_pop(L, 1); // removes value, keeps key for next iteration
1222                         }
1223                 }
1224
1225                 return istack;
1226         } else {
1227                 throw LuaError("Expecting itemstack, itemstring, table or nil");
1228         }
1229 }
1230
1231 /******************************************************************************/
1232 void push_tool_capabilities(lua_State *L,
1233                 const ToolCapabilities &toolcap)
1234 {
1235         lua_newtable(L);
1236         setfloatfield(L, -1, "full_punch_interval", toolcap.full_punch_interval);
1237                 setintfield(L, -1, "max_drop_level", toolcap.max_drop_level);
1238                 // Create groupcaps table
1239                 lua_newtable(L);
1240                 // For each groupcap
1241                 for (const auto &gc_it : toolcap.groupcaps) {
1242                         // Create groupcap table
1243                         lua_newtable(L);
1244                         const std::string &name = gc_it.first;
1245                         const ToolGroupCap &groupcap = gc_it.second;
1246                         // Create subtable "times"
1247                         lua_newtable(L);
1248                         for (auto time : groupcap.times) {
1249                                 lua_pushinteger(L, time.first);
1250                                 lua_pushnumber(L, time.second);
1251                                 lua_settable(L, -3);
1252                         }
1253                         // Set subtable "times"
1254                         lua_setfield(L, -2, "times");
1255                         // Set simple parameters
1256                         setintfield(L, -1, "maxlevel", groupcap.maxlevel);
1257                         setintfield(L, -1, "uses", groupcap.uses);
1258                         // Insert groupcap table into groupcaps table
1259                         lua_setfield(L, -2, name.c_str());
1260                 }
1261                 // Set groupcaps table
1262                 lua_setfield(L, -2, "groupcaps");
1263                 //Create damage_groups table
1264                 lua_newtable(L);
1265                 // For each damage group
1266                 for (const auto &damageGroup : toolcap.damageGroups) {
1267                         // Create damage group table
1268                         lua_pushinteger(L, damageGroup.second);
1269                         lua_setfield(L, -2, damageGroup.first.c_str());
1270                 }
1271                 lua_setfield(L, -2, "damage_groups");
1272 }
1273
1274 /******************************************************************************/
1275 void push_inventory_list(lua_State *L, Inventory *inv, const char *name)
1276 {
1277         InventoryList *invlist = inv->getList(name);
1278         if(invlist == NULL){
1279                 lua_pushnil(L);
1280                 return;
1281         }
1282         std::vector<ItemStack> items;
1283         for(u32 i=0; i<invlist->getSize(); i++)
1284                 items.push_back(invlist->getItem(i));
1285         push_items(L, items);
1286 }
1287
1288 /******************************************************************************/
1289 void read_inventory_list(lua_State *L, int tableindex,
1290                 Inventory *inv, const char *name, Server* srv, int forcesize)
1291 {
1292         if(tableindex < 0)
1293                 tableindex = lua_gettop(L) + 1 + tableindex;
1294         // If nil, delete list
1295         if(lua_isnil(L, tableindex)){
1296                 inv->deleteList(name);
1297                 return;
1298         }
1299         // Otherwise set list
1300         std::vector<ItemStack> items = read_items(L, tableindex,srv);
1301         int listsize = (forcesize != -1) ? forcesize : items.size();
1302         InventoryList *invlist = inv->addList(name, listsize);
1303         int index = 0;
1304         for(std::vector<ItemStack>::const_iterator
1305                         i = items.begin(); i != items.end(); ++i){
1306                 if(forcesize != -1 && index == forcesize)
1307                         break;
1308                 invlist->changeItem(index, *i);
1309                 index++;
1310         }
1311         while(forcesize != -1 && index < forcesize){
1312                 invlist->deleteItem(index);
1313                 index++;
1314         }
1315 }
1316
1317 /******************************************************************************/
1318 struct TileAnimationParams read_animation_definition(lua_State *L, int index)
1319 {
1320         if(index < 0)
1321                 index = lua_gettop(L) + 1 + index;
1322
1323         struct TileAnimationParams anim;
1324         anim.type = TAT_NONE;
1325         if (!lua_istable(L, index))
1326                 return anim;
1327
1328         anim.type = (TileAnimationType)
1329                 getenumfield(L, index, "type", es_TileAnimationType,
1330                 TAT_NONE);
1331         if (anim.type == TAT_VERTICAL_FRAMES) {
1332                 // {type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}
1333                 anim.vertical_frames.aspect_w =
1334                         getintfield_default(L, index, "aspect_w", 16);
1335                 anim.vertical_frames.aspect_h =
1336                         getintfield_default(L, index, "aspect_h", 16);
1337                 anim.vertical_frames.length =
1338                         getfloatfield_default(L, index, "length", 1.0);
1339         } else if (anim.type == TAT_SHEET_2D) {
1340                 // {type="sheet_2d", frames_w=5, frames_h=3, frame_length=0.5}
1341                 getintfield(L, index, "frames_w",
1342                         anim.sheet_2d.frames_w);
1343                 getintfield(L, index, "frames_h",
1344                         anim.sheet_2d.frames_h);
1345                 getfloatfield(L, index, "frame_length",
1346                         anim.sheet_2d.frame_length);
1347         }
1348
1349         return anim;
1350 }
1351
1352 /******************************************************************************/
1353 ToolCapabilities read_tool_capabilities(
1354                 lua_State *L, int table)
1355 {
1356         ToolCapabilities toolcap;
1357         getfloatfield(L, table, "full_punch_interval", toolcap.full_punch_interval);
1358         getintfield(L, table, "max_drop_level", toolcap.max_drop_level);
1359         lua_getfield(L, table, "groupcaps");
1360         if(lua_istable(L, -1)){
1361                 int table_groupcaps = lua_gettop(L);
1362                 lua_pushnil(L);
1363                 while(lua_next(L, table_groupcaps) != 0){
1364                         // key at index -2 and value at index -1
1365                         std::string groupname = luaL_checkstring(L, -2);
1366                         if(lua_istable(L, -1)){
1367                                 int table_groupcap = lua_gettop(L);
1368                                 // This will be created
1369                                 ToolGroupCap groupcap;
1370                                 // Read simple parameters
1371                                 getintfield(L, table_groupcap, "maxlevel", groupcap.maxlevel);
1372                                 getintfield(L, table_groupcap, "uses", groupcap.uses);
1373                                 // DEPRECATED: maxwear
1374                                 float maxwear = 0;
1375                                 if (getfloatfield(L, table_groupcap, "maxwear", maxwear)){
1376                                         if (maxwear != 0)
1377                                                 groupcap.uses = 1.0/maxwear;
1378                                         else
1379                                                 groupcap.uses = 0;
1380                                         warningstream << "Field \"maxwear\" is deprecated; "
1381                                                         << "replace with uses=1/maxwear" << std::endl;
1382                                         infostream << script_get_backtrace(L) << std::endl;
1383                                 }
1384                                 // Read "times" table
1385                                 lua_getfield(L, table_groupcap, "times");
1386                                 if(lua_istable(L, -1)){
1387                                         int table_times = lua_gettop(L);
1388                                         lua_pushnil(L);
1389                                         while(lua_next(L, table_times) != 0){
1390                                                 // key at index -2 and value at index -1
1391                                                 int rating = luaL_checkinteger(L, -2);
1392                                                 float time = luaL_checknumber(L, -1);
1393                                                 groupcap.times[rating] = time;
1394                                                 // removes value, keeps key for next iteration
1395                                                 lua_pop(L, 1);
1396                                         }
1397                                 }
1398                                 lua_pop(L, 1);
1399                                 // Insert groupcap into toolcap
1400                                 toolcap.groupcaps[groupname] = groupcap;
1401                         }
1402                         // removes value, keeps key for next iteration
1403                         lua_pop(L, 1);
1404                 }
1405         }
1406         lua_pop(L, 1);
1407
1408         lua_getfield(L, table, "damage_groups");
1409         if(lua_istable(L, -1)){
1410                 int table_damage_groups = lua_gettop(L);
1411                 lua_pushnil(L);
1412                 while(lua_next(L, table_damage_groups) != 0){
1413                         // key at index -2 and value at index -1
1414                         std::string groupname = luaL_checkstring(L, -2);
1415                         u16 value = luaL_checkinteger(L, -1);
1416                         toolcap.damageGroups[groupname] = value;
1417                         // removes value, keeps key for next iteration
1418                         lua_pop(L, 1);
1419                 }
1420         }
1421         lua_pop(L, 1);
1422         return toolcap;
1423 }
1424
1425 /******************************************************************************/
1426 void push_dig_params(lua_State *L,const DigParams &params)
1427 {
1428         lua_newtable(L);
1429         setboolfield(L, -1, "diggable", params.diggable);
1430         setfloatfield(L, -1, "time", params.time);
1431         setintfield(L, -1, "wear", params.wear);
1432 }
1433
1434 /******************************************************************************/
1435 void push_hit_params(lua_State *L,const HitParams &params)
1436 {
1437         lua_newtable(L);
1438         setintfield(L, -1, "hp", params.hp);
1439         setintfield(L, -1, "wear", params.wear);
1440 }
1441
1442 /******************************************************************************/
1443
1444 bool getflagsfield(lua_State *L, int table, const char *fieldname,
1445         FlagDesc *flagdesc, u32 *flags, u32 *flagmask)
1446 {
1447         lua_getfield(L, table, fieldname);
1448
1449         bool success = read_flags(L, -1, flagdesc, flags, flagmask);
1450
1451         lua_pop(L, 1);
1452
1453         return success;
1454 }
1455
1456 bool read_flags(lua_State *L, int index, FlagDesc *flagdesc,
1457         u32 *flags, u32 *flagmask)
1458 {
1459         if (lua_isstring(L, index)) {
1460                 std::string flagstr = lua_tostring(L, index);
1461                 *flags = readFlagString(flagstr, flagdesc, flagmask);
1462         } else if (lua_istable(L, index)) {
1463                 *flags = read_flags_table(L, index, flagdesc, flagmask);
1464         } else {
1465                 return false;
1466         }
1467
1468         return true;
1469 }
1470
1471 u32 read_flags_table(lua_State *L, int table, FlagDesc *flagdesc, u32 *flagmask)
1472 {
1473         u32 flags = 0, mask = 0;
1474         char fnamebuf[64] = "no";
1475
1476         for (int i = 0; flagdesc[i].name; i++) {
1477                 bool result;
1478
1479                 if (getboolfield(L, table, flagdesc[i].name, result)) {
1480                         mask |= flagdesc[i].flag;
1481                         if (result)
1482                                 flags |= flagdesc[i].flag;
1483                 }
1484
1485                 strlcpy(fnamebuf + 2, flagdesc[i].name, sizeof(fnamebuf) - 2);
1486                 if (getboolfield(L, table, fnamebuf, result))
1487                         mask |= flagdesc[i].flag;
1488         }
1489
1490         if (flagmask)
1491                 *flagmask = mask;
1492
1493         return flags;
1494 }
1495
1496 void push_flags_string(lua_State *L, FlagDesc *flagdesc, u32 flags, u32 flagmask)
1497 {
1498         std::string flagstring = writeFlagString(flags, flagdesc, flagmask);
1499         lua_pushlstring(L, flagstring.c_str(), flagstring.size());
1500 }
1501
1502 /******************************************************************************/
1503 /* Lua Stored data!                                                           */
1504 /******************************************************************************/
1505
1506 /******************************************************************************/
1507 void read_groups(lua_State *L, int index, ItemGroupList &result)
1508 {
1509         if (!lua_istable(L,index))
1510                 return;
1511         result.clear();
1512         lua_pushnil(L);
1513         if(index < 0)
1514                 index -= 1;
1515         while(lua_next(L, index) != 0){
1516                 // key at index -2 and value at index -1
1517                 std::string name = luaL_checkstring(L, -2);
1518                 int rating = luaL_checkinteger(L, -1);
1519                 result[name] = rating;
1520                 // removes value, keeps key for next iteration
1521                 lua_pop(L, 1);
1522         }
1523 }
1524
1525 /******************************************************************************/
1526 void push_groups(lua_State *L, const ItemGroupList &groups)
1527 {
1528         lua_newtable(L);
1529         for (const auto &group : groups) {
1530                 lua_pushnumber(L, group.second);
1531                 lua_setfield(L, -2, group.first.c_str());
1532         }
1533 }
1534
1535 /******************************************************************************/
1536 void push_items(lua_State *L, const std::vector<ItemStack> &items)
1537 {
1538         lua_createtable(L, items.size(), 0);
1539         for (u32 i = 0; i != items.size(); i++) {
1540                 LuaItemStack::create(L, items[i]);
1541                 lua_rawseti(L, -2, i + 1);
1542         }
1543 }
1544
1545 /******************************************************************************/
1546 std::vector<ItemStack> read_items(lua_State *L, int index, Server *srv)
1547 {
1548         if(index < 0)
1549                 index = lua_gettop(L) + 1 + index;
1550
1551         std::vector<ItemStack> items;
1552         luaL_checktype(L, index, LUA_TTABLE);
1553         lua_pushnil(L);
1554         while (lua_next(L, index)) {
1555                 s32 key = luaL_checkinteger(L, -2);
1556                 if (key < 1) {
1557                         throw LuaError("Invalid inventory list index");
1558                 }
1559                 if (items.size() < (u32) key) {
1560                         items.resize(key);
1561                 }
1562                 items[key - 1] = read_item(L, -1, srv->idef());
1563                 lua_pop(L, 1);
1564         }
1565         return items;
1566 }
1567
1568 /******************************************************************************/
1569 void luaentity_get(lua_State *L, u16 id)
1570 {
1571         // Get luaentities[i]
1572         lua_getglobal(L, "core");
1573         lua_getfield(L, -1, "luaentities");
1574         luaL_checktype(L, -1, LUA_TTABLE);
1575         lua_pushnumber(L, id);
1576         lua_gettable(L, -2);
1577         lua_remove(L, -2); // Remove luaentities
1578         lua_remove(L, -2); // Remove core
1579 }
1580
1581 /******************************************************************************/
1582 bool read_noiseparams(lua_State *L, int index, NoiseParams *np)
1583 {
1584         if (index < 0)
1585                 index = lua_gettop(L) + 1 + index;
1586
1587         if (!lua_istable(L, index))
1588                 return false;
1589
1590         getfloatfield(L, index, "offset",      np->offset);
1591         getfloatfield(L, index, "scale",       np->scale);
1592         getfloatfield(L, index, "persist",     np->persist);
1593         getfloatfield(L, index, "persistence", np->persist);
1594         getfloatfield(L, index, "lacunarity",  np->lacunarity);
1595         getintfield(L,   index, "seed",        np->seed);
1596         getintfield(L,   index, "octaves",     np->octaves);
1597
1598         u32 flags    = 0;
1599         u32 flagmask = 0;
1600         np->flags = getflagsfield(L, index, "flags", flagdesc_noiseparams,
1601                 &flags, &flagmask) ? flags : NOISE_FLAG_DEFAULTS;
1602
1603         lua_getfield(L, index, "spread");
1604         np->spread  = read_v3f(L, -1);
1605         lua_pop(L, 1);
1606
1607         return true;
1608 }
1609
1610 void push_noiseparams(lua_State *L, NoiseParams *np)
1611 {
1612         lua_newtable(L);
1613         push_float_string(L, np->offset);
1614         lua_setfield(L, -2, "offset");
1615         push_float_string(L, np->scale);
1616         lua_setfield(L, -2, "scale");
1617         push_float_string(L, np->persist);
1618         lua_setfield(L, -2, "persistence");
1619         push_float_string(L, np->lacunarity);
1620         lua_setfield(L, -2, "lacunarity");
1621         lua_pushnumber(L, np->seed);
1622         lua_setfield(L, -2, "seed");
1623         lua_pushnumber(L, np->octaves);
1624         lua_setfield(L, -2, "octaves");
1625
1626         push_flags_string(L, flagdesc_noiseparams, np->flags,
1627                 np->flags);
1628         lua_setfield(L, -2, "flags");
1629
1630         push_v3_float_string(L, np->spread);
1631         lua_setfield(L, -2, "spread");
1632 }
1633
1634 /******************************************************************************/
1635 // Returns depth of json value tree
1636 static int push_json_value_getdepth(const Json::Value &value)
1637 {
1638         if (!value.isArray() && !value.isObject())
1639                 return 1;
1640
1641         int maxdepth = 0;
1642         for (const auto &it : value) {
1643                 int elemdepth = push_json_value_getdepth(it);
1644                 if (elemdepth > maxdepth)
1645                         maxdepth = elemdepth;
1646         }
1647         return maxdepth + 1;
1648 }
1649 // Recursive function to convert JSON --> Lua table
1650 static bool push_json_value_helper(lua_State *L, const Json::Value &value,
1651                 int nullindex)
1652 {
1653         switch(value.type()) {
1654                 case Json::nullValue:
1655                 default:
1656                         lua_pushvalue(L, nullindex);
1657                         break;
1658                 case Json::intValue:
1659                         lua_pushinteger(L, value.asInt());
1660                         break;
1661                 case Json::uintValue:
1662                         lua_pushinteger(L, value.asUInt());
1663                         break;
1664                 case Json::realValue:
1665                         lua_pushnumber(L, value.asDouble());
1666                         break;
1667                 case Json::stringValue:
1668                         {
1669                                 const char *str = value.asCString();
1670                                 lua_pushstring(L, str ? str : "");
1671                         }
1672                         break;
1673                 case Json::booleanValue:
1674                         lua_pushboolean(L, value.asInt());
1675                         break;
1676                 case Json::arrayValue:
1677                         lua_newtable(L);
1678                         for (Json::Value::const_iterator it = value.begin();
1679                                         it != value.end(); ++it) {
1680                                 push_json_value_helper(L, *it, nullindex);
1681                                 lua_rawseti(L, -2, it.index() + 1);
1682                         }
1683                         break;
1684                 case Json::objectValue:
1685                         lua_newtable(L);
1686                         for (Json::Value::const_iterator it = value.begin();
1687                                         it != value.end(); ++it) {
1688 #ifndef JSONCPP_STRING
1689                                 const char *str = it.memberName();
1690                                 lua_pushstring(L, str ? str : "");
1691 #else
1692                                 std::string str = it.name();
1693                                 lua_pushstring(L, str.c_str());
1694 #endif
1695                                 push_json_value_helper(L, *it, nullindex);
1696                                 lua_rawset(L, -3);
1697                         }
1698                         break;
1699         }
1700         return true;
1701 }
1702 // converts JSON --> Lua table; returns false if lua stack limit exceeded
1703 // nullindex: Lua stack index of value to use in place of JSON null
1704 bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
1705 {
1706         if(nullindex < 0)
1707                 nullindex = lua_gettop(L) + 1 + nullindex;
1708
1709         int depth = push_json_value_getdepth(value);
1710
1711         // The maximum number of Lua stack slots used at each recursion level
1712         // of push_json_value_helper is 2, so make sure there a depth * 2 slots
1713         if (lua_checkstack(L, depth * 2))
1714                 return push_json_value_helper(L, value, nullindex);
1715
1716         return false;
1717 }
1718
1719 // Converts Lua table --> JSON
1720 void read_json_value(lua_State *L, Json::Value &root, int index, u8 recursion)
1721 {
1722         if (recursion > 16) {
1723                 throw SerializationError("Maximum recursion depth exceeded");
1724         }
1725         int type = lua_type(L, index);
1726         if (type == LUA_TBOOLEAN) {
1727                 root = (bool) lua_toboolean(L, index);
1728         } else if (type == LUA_TNUMBER) {
1729                 root = lua_tonumber(L, index);
1730         } else if (type == LUA_TSTRING) {
1731                 size_t len;
1732                 const char *str = lua_tolstring(L, index, &len);
1733                 root = std::string(str, len);
1734         } else if (type == LUA_TTABLE) {
1735                 lua_pushnil(L);
1736                 while (lua_next(L, index)) {
1737                         // Key is at -2 and value is at -1
1738                         Json::Value value;
1739                         read_json_value(L, value, lua_gettop(L), recursion + 1);
1740
1741                         Json::ValueType roottype = root.type();
1742                         int keytype = lua_type(L, -1);
1743                         if (keytype == LUA_TNUMBER) {
1744                                 lua_Number key = lua_tonumber(L, -1);
1745                                 if (roottype != Json::nullValue && roottype != Json::arrayValue) {
1746                                         throw SerializationError("Can't mix array and object values in JSON");
1747                                 } else if (key < 1) {
1748                                         throw SerializationError("Can't use zero-based or negative indexes in JSON");
1749                                 } else if (floor(key) != key) {
1750                                         throw SerializationError("Can't use indexes with a fractional part in JSON");
1751                                 }
1752                                 root[(Json::ArrayIndex) key - 1] = value;
1753                         } else if (keytype == LUA_TSTRING) {
1754                                 if (roottype != Json::nullValue && roottype != Json::objectValue) {
1755                                         throw SerializationError("Can't mix array and object values in JSON");
1756                                 }
1757                                 root[lua_tostring(L, -1)] = value;
1758                         } else {
1759                                 throw SerializationError("Lua key to convert to JSON is not a string or number");
1760                         }
1761                 }
1762         } else if (type == LUA_TNIL) {
1763                 root = Json::nullValue;
1764         } else {
1765                 throw SerializationError("Can only store booleans, numbers, strings, objects, arrays, and null in JSON");
1766         }
1767         lua_pop(L, 1); // Pop value
1768 }
1769
1770 void push_pointed_thing(lua_State *L, const PointedThing &pointed, bool csm,
1771         bool hitpoint)
1772 {
1773         lua_newtable(L);
1774         if (pointed.type == POINTEDTHING_NODE) {
1775                 lua_pushstring(L, "node");
1776                 lua_setfield(L, -2, "type");
1777                 push_v3s16(L, pointed.node_undersurface);
1778                 lua_setfield(L, -2, "under");
1779                 push_v3s16(L, pointed.node_abovesurface);
1780                 lua_setfield(L, -2, "above");
1781         } else if (pointed.type == POINTEDTHING_OBJECT) {
1782                 lua_pushstring(L, "object");
1783                 lua_setfield(L, -2, "type");
1784
1785                 if (csm) {
1786                         lua_pushinteger(L, pointed.object_id);
1787                         lua_setfield(L, -2, "id");
1788                 } else {
1789                         push_objectRef(L, pointed.object_id);
1790                         lua_setfield(L, -2, "ref");
1791                 }
1792         } else {
1793                 lua_pushstring(L, "nothing");
1794                 lua_setfield(L, -2, "type");
1795         }
1796         if (hitpoint && (pointed.type != POINTEDTHING_NOTHING)) {
1797                 push_v3f(L, pointed.intersection_point / BS); // convert to node coords
1798                 lua_setfield(L, -2, "intersection_point");
1799                 push_v3s16(L, pointed.intersection_normal);
1800                 lua_setfield(L, -2, "intersection_normal");
1801                 lua_pushinteger(L, pointed.box_id + 1); // change to Lua array index
1802                 lua_setfield(L, -2, "box_id");
1803         }
1804 }
1805
1806 void push_objectRef(lua_State *L, const u16 id)
1807 {
1808         // Get core.object_refs[i]
1809         lua_getglobal(L, "core");
1810         lua_getfield(L, -1, "object_refs");
1811         luaL_checktype(L, -1, LUA_TTABLE);
1812         lua_pushnumber(L, id);
1813         lua_gettable(L, -2);
1814         lua_remove(L, -2); // object_refs
1815         lua_remove(L, -2); // core
1816 }
1817
1818 void read_hud_element(lua_State *L, HudElement *elem)
1819 {
1820         elem->type = (HudElementType)getenumfield(L, 2, "hud_elem_type",
1821                                                                         es_HudElementType, HUD_ELEM_TEXT);
1822
1823         lua_getfield(L, 2, "position");
1824         elem->pos = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1825         lua_pop(L, 1);
1826
1827         lua_getfield(L, 2, "scale");
1828         elem->scale = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1829         lua_pop(L, 1);
1830
1831         lua_getfield(L, 2, "size");
1832         elem->size = lua_istable(L, -1) ? read_v2s32(L, -1) : v2s32();
1833         lua_pop(L, 1);
1834
1835         elem->name   = getstringfield_default(L, 2, "name", "");
1836         elem->text   = getstringfield_default(L, 2, "text", "");
1837         elem->number = getintfield_default(L, 2, "number", 0);
1838         elem->item   = getintfield_default(L, 2, "item", 0);
1839         elem->dir    = getintfield_default(L, 2, "direction", 0);
1840
1841         // Deprecated, only for compatibility's sake
1842         if (elem->dir == 0)
1843                 elem->dir = getintfield_default(L, 2, "dir", 0);
1844
1845         lua_getfield(L, 2, "alignment");
1846         elem->align = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1847         lua_pop(L, 1);
1848
1849         lua_getfield(L, 2, "offset");
1850         elem->offset = lua_istable(L, -1) ? read_v2f(L, -1) : v2f();
1851         lua_pop(L, 1);
1852
1853         lua_getfield(L, 2, "world_pos");
1854         elem->world_pos = lua_istable(L, -1) ? read_v3f(L, -1) : v3f();
1855         lua_pop(L, 1);
1856
1857         /* check for known deprecated element usage */
1858         if ((elem->type  == HUD_ELEM_STATBAR) && (elem->size == v2s32()))
1859                 log_deprecated(L,"Deprecated usage of statbar without size!");
1860 }
1861
1862 void push_hud_element(lua_State *L, HudElement *elem)
1863 {
1864         lua_newtable(L);
1865
1866         lua_pushstring(L, es_HudElementType[(u8)elem->type].str);
1867         lua_setfield(L, -2, "type");
1868
1869         push_v2f(L, elem->pos);
1870         lua_setfield(L, -2, "position");
1871
1872         lua_pushstring(L, elem->name.c_str());
1873         lua_setfield(L, -2, "name");
1874
1875         push_v2f(L, elem->scale);
1876         lua_setfield(L, -2, "scale");
1877
1878         lua_pushstring(L, elem->text.c_str());
1879         lua_setfield(L, -2, "text");
1880
1881         lua_pushnumber(L, elem->number);
1882         lua_setfield(L, -2, "number");
1883
1884         lua_pushnumber(L, elem->item);
1885         lua_setfield(L, -2, "item");
1886
1887         lua_pushnumber(L, elem->dir);
1888         lua_setfield(L, -2, "direction");
1889
1890         push_v2f(L, elem->offset);
1891         lua_setfield(L, -2, "offset");
1892
1893         push_v2f(L, elem->align);
1894         lua_setfield(L, -2, "alignment");
1895
1896         push_v2s32(L, elem->size);
1897         lua_setfield(L, -2, "size");
1898
1899         // Deprecated, only for compatibility's sake
1900         lua_pushnumber(L, elem->dir);
1901         lua_setfield(L, -2, "dir");
1902
1903         push_v3f(L, elem->world_pos);
1904         lua_setfield(L, -2, "world_pos");
1905 }
1906
1907 HudElementStat read_hud_change(lua_State *L, HudElement *elem, void **value)
1908 {
1909         HudElementStat stat = HUD_STAT_NUMBER;
1910         if (lua_isstring(L, 3)) {
1911                 int statint;
1912                 std::string statstr = lua_tostring(L, 3);
1913                 stat = string_to_enum(es_HudElementStat, statint, statstr) ?
1914                                 (HudElementStat)statint : stat;
1915         }
1916
1917         switch (stat) {
1918                 case HUD_STAT_POS:
1919                         elem->pos = read_v2f(L, 4);
1920                         *value = &elem->pos;
1921                         break;
1922                 case HUD_STAT_NAME:
1923                         elem->name = luaL_checkstring(L, 4);
1924                         *value = &elem->name;
1925                         break;
1926                 case HUD_STAT_SCALE:
1927                         elem->scale = read_v2f(L, 4);
1928                         *value = &elem->scale;
1929                         break;
1930                 case HUD_STAT_TEXT:
1931                         elem->text = luaL_checkstring(L, 4);
1932                         *value = &elem->text;
1933                         break;
1934                 case HUD_STAT_NUMBER:
1935                         elem->number = luaL_checknumber(L, 4);
1936                         *value = &elem->number;
1937                         break;
1938                 case HUD_STAT_ITEM:
1939                         elem->item = luaL_checknumber(L, 4);
1940                         *value = &elem->item;
1941                         break;
1942                 case HUD_STAT_DIR:
1943                         elem->dir = luaL_checknumber(L, 4);
1944                         *value = &elem->dir;
1945                         break;
1946                 case HUD_STAT_ALIGN:
1947                         elem->align = read_v2f(L, 4);
1948                         *value = &elem->align;
1949                         break;
1950                 case HUD_STAT_OFFSET:
1951                         elem->offset = read_v2f(L, 4);
1952                         *value = &elem->offset;
1953                         break;
1954                 case HUD_STAT_WORLD_POS:
1955                         elem->world_pos = read_v3f(L, 4);
1956                         *value = &elem->world_pos;
1957                         break;
1958                 case HUD_STAT_SIZE:
1959                         elem->size = read_v2s32(L, 4);
1960                         *value = &elem->size;
1961                         break;
1962         }
1963         return stat;
1964 }